How to run Outlook VBA sub from Outlook dll

Hi

I have c# COM dll (Net 4 for client) for Outlook  2007

The dll has to run VBA sub (both dll & sub run on Outlook)

invoke method crashes Outlook, so i try

 System.Type objAppType = System.Type.GetTypeFromProgID("Outlook.Application");
 object objApp = System.Runtime.InteropServices.Marshal.GetActiveObject("Outlook.Application");
                Debug.Write  ("1");
 objAppType.InvokeMember("CB", System.Reflection.BindingFlags.Default | System.Reflection.BindingFlags.InvokeMethod, null, objApp, strArr);
                Debug.Write  ("2");

No exception is caused by this code

Any help would be appreciated

Thanks